Include a mark as read X under the scroll to unread button

[mstriemer]

This adds a simple X button under the scroll to top button that will mark all as read.

Probably needs some tests or something, but I didn't want to invest too much into this if it wasn't the desired solution.

Looks like the functionality was nearly there but I might be missing something. Open to suggestions but mostly wanted to get something started here.

Fixes element-hq/element-web#8666.

[turt2live]

Code-wise seems fine, just needs design review and a sign-off.

Easiest way to do sign off would be to leave a comment here with the following template:

Signed-off-by: Your Name <email@example.org>

[nadonomy]

Hey @mstriemer thanks for this! I think being able to dismiss the read marker is super useful.

Relatedly, the logic and interactions behind read markers in general could do with re-visiting, which we do plan to do, so these specific changes may end up being short lived if we arrive at a different more holistic solution. But, I don't see that as a reason to block this PR.

I can see some opportunities in sophisticating the mechanic to reveal itself when hovering over the up arrow, but we can dogfood this first and go from there.

LGTM!

[turt2live]

Awesome, thanks Nad! @mstriemer please sign off on the changes and we can merge it :)

[mstriemer]

@turt2live I don't see anything in the readmes about the sign-off. What's the purpose of it? Just want to know what I'm signing off on :)

[turt2live]

Through a series of clicking links, you'd eventually land on this: https://github.com/matrix-org/matrix-js-sdk/blob/master/CONTRIBUTING.rst#sign-off

It's essentially to say you're okay with us merging the code, and that you have the right to submit it in the first place (ie: not stealing code from some other project and PRing it under your own name).

[mstriemer]

Cool, thanks! I checked the readme for this repo which has a link to a contributing guide that 404s, I'm guessing it should link to that page instead?

Signed-off-by: Mark Striemer <mstriemer@gmail.com>

[turt2live]

Cool, thanks! I checked the readme for this repo which has a link to a contributing guide that 404s, I'm guessing it should link to that page instead?

ah, yes, that should be a useful link and not a useless one. Will get that fixed.

Thanks!